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TM 10-4930-250-13&P
m
meter
mm
millimeter
NPT
NationalPipeThread
PMCS
Preventive Maintenance Checks and Services
psi
pounds per square inch
PTO
Power Take Off
QD
Quick Disconnect
QTY
Quantity
RPM
Revolutions Per Minute
SMR code
Source, Maintenance and Recoverability Code
VDC
Volts, Direct Current
1.7.3
Glossary.
Ballooning
Localized area of swelling on a fuel hose under pressure, indicating a weak area which may
burst.
Bonding
Electrically connecting units before operations begin in order to equalize any static potential
that might exist and to provide a continuous path for any static potential that might be
generated after operations begin. Static potential is eliminated or prevented by grounding one
or more of the bonded units.
Coalesce
To grow together. To unite into a whole. To cause small droplets of water to unite into
larger drops.
Coalescer Element
A filter element designed to remove solid contaminants, and to break the emulsion of water
in the pumpage into large droplets. The pumpage flows from the inside to the outside of the
element.
Detective
Condition of a part that prevents the part from performing its intended function, caused by
normal aging, accident or manufacturing imperfection.
Deterioration
Condition of a part caused by weathering, excessive heat, excessive cold, chemical action,
etc.
Differential
pressure
Difference between inlet and outlet pressure at a filter or pump. An increase of differential
pressure indicates a restriction or blockage in the unit (e.g., a build up of sediment in a
filter).
Discharge Hose
Collapsible hose used on the output (discharge) side of the fuel transfer pump.
Dry break
Separation of couplings without loss of fuel.
Emulsion
A dispersion of fine water droplets in the pumpage.
Energize
Apply electrical power.
Grounding
Connecting single or bonded units to a ground rod so that any static potential will be
discharged into the earth. If two or more units are bonded and one is grounded, the entire
system is effectively grounded.
Malfunction
Failure to operate in a normal manner.
Monitor
To observe a condition or operation such as that indicated by an indicator light or meter.
1-3
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